Electronics > Beginners
Black powdery residue after changing tip
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fixit7:
When I changed my tip to a different type on my Chinese copy of a Hakko, I saw a small amount of black powdery residue that came out.

I have used the soldering around 50 times. Is that part of a carbon rod?

I plan on getting a better iron that actually maintains the right temp.

Thanks,
          Andy
bob91343:
That's just oxide accumulation, very normal.  Clean it up for best results, as it's not as good a heat conductor as metal.  In the long run it can build up enough to make the iron less effective.
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